Researchers from the University of Florida developed a new OTFT for AMOLED displays. The new OTFT has a novel stacked vertical structure that automatically gives a large gate area. A thin gate can be achieved by spin-coating or other techniques. They say that 200µm resolution is sufficient to lay out the drain electrode which is the most demanding feature, compared with 25µm needed for some lateral TFTs.
The team prepares a paper that is due very soon to explain the new OTFT. There are still challenges of course to overcome in this design.